Colored cement composition and method for preparing the same



Aug. 7, 11923.

J. W. LEDEOER COLORED CEMENT COMPOSITION AND METHOD OF PREPARING THE SAME Filed DGO. 18, 1919 3 vwc 111:01,

Patented lling., fl, lQEi,

entre y, j matan lr lthldhi JOHN W. lLElDElEXlER, OF MEIJER, PENNSYLVANIA, SSIGNOR .l SHINGLE,

SMTE dt SHEATEIENG COMPANY, A CORPORATEUN (NFA PENNSSJQVAAWA. J

CULOREID CEMENT CUMPOSXTION AND METEO@ .'iillt PREPARNG THE SAME..

application niet necemteiie, ieia sensi in. aliases.

To all wko/m, it 'may concern;

Be it known that ll, JOHN W. Lenawee,

f citizen of the United States, residing at Ambler, in the county of Montgomery and State oflPennsylvania, have invented certain new and useful Improvements in Colored Cement Composition and Methods for Preparing the Same, of which the following is aspeciication.

rlhis invention relates to hydraulic cement and fiber cbmposition material and particularly to such material as a composition stonelilre product colored on thesurface and to (a process for making lthe same. llt is especially applicable to products of hydraulic cement and fibrous material such as asbestos, in slab or sheet form as frequently used in builders7 boards, shingles, artificial slate, etc.y 'For many uses., the natural grey color of the cement composition is undesirable and coloring matter has been mixed with Ythe composition to give the desired shade of red, green, blue, etc. Such coloring matten thus 'diid'used through the mass is expensive and its presence in the composition detracts from the stren h of the latter.,

The object o this invention is to provide a cement-liber composition sheet or slab having a colored surface attained with a minimum amount of coloring matter and Without 1Wealtening the sheet or slab. With this object in i vievvy the coloring of this invention ,isl applied ,veiition .as applied to the bui to the composition in such form and at such time in the formation of the composition that the desired ,coloriiii-g 'willie-confined to the y surface of the final producta f c ln the accompanying drawings illustratingr Ways of producing the composition of this invention,

y Fig l is a diagram illustrating the processl l l containing the cement asbestos material .and an apparatus adapted to ractice the inlding up of the product, l s

Figa@ is diagram illustrating 4modifications, and f lig. 3 is a sectional vievv ofthe product drawn to a relatively large scale.,

lhe product of this invention` comprises/a body of set hydraulic cement and fibrous material such as asbestos in nely dividedi'orm,

-pressed in a hydraulic press allowed to and this body has a desired surface coloring' integral inthe composition; lnl the forma tion of this product the cement and asbestos materials are mixed together with Water and Worked' intol desired form, During this working and before the cement is set' and.

.throughout the interior of the composition.

Preferably the wetting and formation of the composition is begun and carried far enoughto provide fresh surfaces of @own relation` to the hn l product and on these surfaces the coloring matter vis laid ina manner form ing a thin opaque coloring merging into and integral `with the mass of the composition. The colorin such as red oxide of iron in timely divide form may be directly deposited ont e Wet surfaces of the cement asbestos mixture and then Worked into the surface thereof or may. be applied in 'Wet forni to the surface to be colored.7 ln either case it may be advanta ecus" to mir; withthe coloring matter'hnely ividehl cement or ce@ ment and asbestos to assure the same character of material in the surface and form a` firm and integra-l bond between the surface materialA and the body ofthe composition.. Such composite-coloring matter is particu larly advantageous `when the material is applied vvet as it permits the colorineP to be addedis freshly wetted and newly iormed asbestos cement material similar in character to the surface to which. it is applied and readily and integrally thenevvitli ln the apparatus shown in igu and ilm lustrating one ineansffor carrying the inventioninto effect a belt i has its lowerv siiiface in contact with drum 6 rotating in vat t set. 'lo color the surface o'fthe ultimate product a second vat 8 is provided a rum 9 and containing coloring matter in form foi1 deposit onvthe under surface of the plastic i lll() ies' film already adhering to the baia 5. This coloring matter may either color the film on the belt or be applied as another surface adhering tothe prior film. For instance in the i so latter case the material in v'at 8 may be as-` bestos cement material mixed with a color such as red oxide of iron and kept stirred by agitators l1. This material will 'pass from drum 9 onto the fresh film from vat 7 and at the cylinder l() will bev pressed in direct contact with the surface of the cylinder and form a smooth surface coloring when thebuilt up layers are stripped and pressed in a hydraulic press and then allowed to set.

In the type of apparatus shown in 'F ig. 1 the feedin of color from drum 9 is preferably interm1ttent and confined to that portion of the film lying next to the cylinder 10. This coloring may therefore appear only on the surface ofthe final product the interior of which is uncolored. The interrupting of the color feed may b edone by hand means, or automatically as for instance by lowering the level ofthe coloring matter in vat 8 by control of the feed thereto. One example of` automatic control is shown, consisting of a roll 12 spaced from cylinder 10 whereby when the material on the cylinder has built up to a certain thickness roll 12 will be rotated to wind up string 13 on the roll axle 14 and raise gate 15 for a small increment 0f the coloring materialv to flow from mixer 16 into vat 8 raising the4 level therein so that drum 9 will carry the color up to the belt 5. The built up'material will be stripped from cylinder 10 just in advanceof the new colored film which will thus be fed directly on to the surface of the cylinder. The stripping of the built up sheet from roll 10 allows roller 12 to drop back and thus automatically closes gate 15 and the feed from drum 9 lowering the level in vat 8 so that the feed therefrom automatically discontinues at the proper time,

confining the coloring to the surface of the final product.

The opposite surface of the product may also be colored, if desired, by permitting the colored lm to feed onto the end of the material on the cylinder just 'before strippmg and at thesame time interrupting the other film.

lVhere as illustrated in F ig. 2 the unset material is available fin a continuous strip 20 on a belt 21 the color film may be appliedi to the surface of the material from above as by roller 22. In this apparaus the 'cement and fibrous material is not built up in layers but is fed directly onto the belt 2l in dry or plastic form and then spread out and rolled into the desired thickness; Where material is fed dry onto the belt it will preferably be wetted as at23 and then surfaced asv by roll 24: before the -color isapplied by roller 22,

after which the material may be again rolled and then cut and stripped yfrom the belt and pressed and allowed to set. In the specific means shown the coloring material in wet form is fed from mixer 25 onto the surface of roller 22 and from there is deposited on the surface of the asbestosl cement strip 20. The application of the color to the surface of the freshly wetted asbestos cement ma.- terial gives a strong bond between the color and the body of the composition forming the whole into a unitary integral mass, while the separate formation of the uncolcred strip confines the coloring to the surfaces. The coloring matter is usually very expensive and great saving is effected in reducing the amount used while'at theisame time the natural strength of the. cement. asbestos composition is retained without adding to the overall thickness. The colored surface is a thoroughly integral part of the complete strip and is without tendency to chip cr scrape ofi:` or cause warping or distortion of the strip as a whole, as is the case, for instance, where it is attempted to combine together two diferently colored slabs in one piece.

While the invention has been particularly described in connection with specific em bodiments it is not confined thereto but is .intended to cover such modifications as fall mogeneously mixed throughout said filmy which is pressed together with said body portion and set therewith as a solid, inte al mass having its interior of one color an its surface film of a different color.

2. A product comprising a sheet or slab having an interior body portion of bre and set hydraulic cement having a natural characteristic grey color and a surface film of cementitious material and coloring matter having a color different fromthat of said body portion homogeneously mixed throughout said film which is pressed together with said body portion and set therewith as a solid, integral mass having its interior of one color and its surface film of a different icolor.

3. A product comprising a'sheet or slab having an interior body portion of homogeneously mixed fibre and set hydraulic cement having'a characteristic color, and a'surface film'of hydraulic cement and fibre and coloring matter havin a color different from that of said body portion, said coloring matter beingl homogeneously mixed with said cement and fibre throughout said film which is pressed together with said body portion and set therewith as a solid, integral mass inoonoi bowing its interior of one coi'oi and itis ennefoce film of n dineren@ ooloi'. v

4L. The process which oompiis Working o mixture of hyoiiouiic oemenfn wenn ond u ngi-ous motei'iul into ine form 'of n sheet oi sinh ond determining the snrfnoe ponts oi?l the somo, then applying fco the suiooe penis n previously mode nim comprising n cemen1tinous composition containing o, coioiing mei?- icn honing o, coioi' din'enent from theft of the ioodiy of the composiiion, subjecting the sheen on sion Ibo nessuno ond oiiowi the Whoie ibo' sein us o soid, integi'oi moss hu iis inno@ inici of one ooion anni its sunfoce nim of on othei' coion Y 5. The pu'ocess which comprises Won-inn up o minimo of hydraulic cement, Wolken-ond bious motorini .into the foi-m of n sheen 'or sio'o ond determining the surfoce ponts of )the some, @hen oppiyin oo the surface ports o pnoviously made on comprising o. similoilj composition contoining nl coloring matter honing o ooioiu oiieren fiom inni; of the Food on' the composition, subjecting lbiicsheei: on lob Lto pressure ond oiiowing the whole izo sei: nso soiid, iniegioil' moss hoving its inoe- Irion of one ooioi" ond its suiioce nim of onoiioei onion.

nonni Wnnnnnonn. 

